Rails - May 2006 - data fixtures for non-activerecord models

I have a model that as an instance maintains a session on a website, and has
methods to return some scraped data.  Instead of hitting a URL over and over
during testing, I would like to just save the source to a file and use that
like a fixture.  A mock object doesn''t seem appropriate, because there
is a
lot of data here.  What I''m doing now is storing each separate
"fixture" in
the directory fixtures/modelnames.  I can''t imagine I''m the
first person to
have a model that maintains data, but does not extend activerecord.  What do
you guys do for this?

Thank you,
Zack
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